Lathe.



M. J; CUNNINGHAM.

' LATHE.

APPLICATION FILED JULY 5, 1906.

Patented Dec. 28, 1909.

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701mm. 5. 001mm ca. PMTO-UMGHAPMEBSIWASHINGTON a c MARTIN J. CUNNINGHAM,0F SPRINGFIELD, MISSOURI.

LATHE.

Specification of Letters Patent.

Application filed July 5, 1906.

Patented Dec. 28, 1909.

Serial No. 324,885.

To all whom it may concern:

HAM, a citizen of the United States, residing at Springfield, in thecounty of Greene and State of Missouri, have invented new and usefulImprovements in Lathes, of which the following is a specification.

My invention relates to improvements in lathes, the object of which isto provide a cheap, simple and convenient means of ad justing the heightof the head and tail blocks of the lathe, and also for providing a lathefor boring and cutting threads on a taper. These objects I attain bymeans of the device illustrated in the accompanying drawings forming apart of this specification in which Figure 1, is a view in elevation ofthe entire device partly cut away to show the gearing. Fig. 2, is an endview in elevation of lathe gearing showing opening at lower end of headblock sleeve. Fig. 3, is a vertical cross section of the tail block andlathe bed. Fig. 4, is a plan view of a part of the frame showing theopening around the pinion for the sleeve of the head block with thepinion which raises it by means of the rack at the side.

Similar letters indicate corresponding parts in the several figures.

A, is an ordinary frame of the lathe, made any desired size and shape,said frame is provided with headand tail blocks which I so construct asto adjust them up and down to vary the swing of the lathe to any desiredheight.

B, is the ordinary head point or center of the lathe.

C is the ordinary tail point or center of the lathe.

D, is the head block of the lathe. It is made with a circular sleeve, Dwhich extends down through the frame of the lathe.

E, is a rack slidable in the frame and provided with a pinion F, formoving the same up and down. Said rack at its upper end rests againstthe lower side of the head block at point D and as the rack rises itelevates the head block and as it lowers lets the head block down. ThisI accomplish by means of a suitable crank or wrench upon the end F ofthe shaft F which carries the pinion F.

To provide a continuous action of the gear wheels G and H as the headblock moves up and down, the shaft G of the gear wheel G slips up anddown through the beveled gear wheel K and the arm bearing L of the arm Lof the sleeve M. This may be accomplished by having a slot G in theshaft G and an ordinary feather in the gear wheel K. The said shaft G isprovided with a suitable bearing at G in the sleeve D of the head-block.The bearing L of the shaft G is secured by an arm L, to the sleeve M,which is secured to the lathe frame A. Said sleeve M, is provided with ashaft M passing through its center to support the bevel gear wheel 0,and by means of this sleeve M, and arm L, is kept in contact with bevelgear wheel K, through which the shaft Gr passes up and down with thehead block to which it is connected by means of bearings G Said sleeve Dof the head block is provided with an opening to let the head block moveup and down and angularly without interfering with sleeve M.

Gear G is kept in contact with beveled gear H as its shaft H is alsoprovided with bearings in the head block and moves up and down with thehead block. Shaft H is provided with a cog wheel H at its outer end andis driven by the ordinary chain of gear wheels from the end of thespindle P. The said spindle P is operated the same as the ones now inuse, by the belts on the cone pulley Q.

When the head block D, is elevated the belts on the cone pulleys arekept tight by any suitable means. I prefer using two pulley wheels R andS mounted on the two brackets D attached to said head block whichbrackets are connected by a square rod D at the top. For this'purposesaid pulleys R and S have studs R and S secured to a lever D*, on an armD for adjusting the tension of the belt by turning the said pulleys upona center between them to form a loop in the belt to take up and let outas much slack as desired when the head block is raised or lowered. Thisis accomplished by having the lever D turn through a block D and by aset screw D is set at the desired position. Said block D has a squarehole to fit the square rod D and is secured in position by a set screwD. The gear wheels may be changed at any elevation of the head block tocut d-ifien ent screw threads as the gearing is not affected by theraising or lowering of the head block.

By reason of the fact that the sleeve M, is secured to the frame A itthus keeps the bearing of the gear wheel 0 which operates the shaft gear0 almost in the same position with reference to the lead screw gear 0thus drivingthe lead screw- 0* in all possible positions of the headblock.

Tail block 7 of the lathe is also. made so as to adjust the centerpointG up and down as desired. Forthis purpose one part of the tail block isprovided with a slot W- and another part which supports the center C isprovided with bolts V and 7 which engage in the said slot permitting thesame to be-"1noved up and down by means of the screw X and the lever orwheel X and the same is secured in position bymeans of the bolts. T andW; The part Y of the tailblpck which eontains the spindle C restsagainst the shoulder Y of" the upright portion of the part WV of thetail blockfor giving it a firm support and receiving the end thrust.

By reason of the fact that the head block Dis formed. below into acircular sleeve D it may be. turned at any desired angle for boring andcutting threads in a taperinghple when desired,the beveled gears G, and

K being in the center of the said sleeve of the head block are thus. notalfected by the turning of the head block of the lathe.

Said sleeve D is held in the desired posi-. tion by means of asemicircular form A of- In a lathe, the combination with a frame,

of a head-block mounted for partialwrotati on said frame,-a spindlemounted upon said head-block, means for bodily elevating saidhead-block, a vertical shaft centrally located within the head-block, a,sliding bevel pinion splined upon said shaft, a lead screw, ahorizontally disposed shaft, connections between said shaft and saidlead screw, and V a bevel pinion upon the inner end of] sard shaftmeshing with the first named bevel pinion.

In testimony whereof I afli x my signature, in presence oftwosubscribing witnesses.

MARTIN CUNNINGHAM.

Witnesses: 7

S. A. Hasnmrnn,

HARoUM.

